feat: linked articles in header

eleventy.config.js

@@ -3,6 +3,7 @@ import markdownIt from "markdown-it";
 import markdownItAnchor from "markdown-it-anchor";
 import { filters } from "./src/_filters/index.js";
 import { postComparator, isPostPublic } from "./src/_utils/sort-posts.js";
+import { validateLinkedArticles } from "./src/_utils/linked-articles.js";
 
 export default function (eleventyConfig) {
   // Build ignored local post fixtures without making them Git-tracked.
@@ -44,8 +45,10 @@ export default function (eleventyConfig) {
   // 5. Custom Collections
   // Pinned / featured prioritized, chronological blog posts collection (excludes drafts and hidden posts)
   eleventyConfig.addCollection("posts", (collectionApi) => {
-    return collectionApi
-      .getFilteredByGlob("src/posts/*.md")
+    const allPosts = collectionApi.getFilteredByGlob("src/posts/*.md");
+    validateLinkedArticles(allPosts);
+
+    return allPosts
       .filter((post) => isPostPublic(post))
       .sort(postComparator);
   });